GENERAL SCIENCE CLASS 9 MCQS
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چار آپشن میں سے کسی ایک پر کلک کرنے سے جواب سرخ ہو جائے گا۔
وہ رجحان جس میں ہومولوس کروموسوم کا جوڑا الگ ہونے میں ناکام ہو جاتا ہے جسے _____ کہا جاتا ہے؟
Non-disjunction
Terminalization
Synapsis
Linkage
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Explanation
Non-disjunction is the phenomenon where a pair of homologous chromosomes (or a pair of sister chromatids) fails to separate properly during meiosis. Resulting in an abnormal number of chromosomes in the daughter cells.This can lead to genetic abnormalities , such as Down syndrome (trisomy 21), or other chromosomal disorders.
مییووسس کا مرحلہ جس میں سنٹرومیرز چھوٹے ہو جاتے ہیں اور جوڑے ہوئے کرومیٹڈس ایک دوسرے سے دور ہو جاتے ہیں؟
Anaphase-II
Metaphase-II
Telophase-II
Prophase-II
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Explanation
In Anaphase-II of meiosis, the centromeres shorten and the paired chromatids (sister chromatids) are pulled away from one another, moving to opposite poles of the cell.This is the stage where the genetic material is finally separated, and each pole receives a complete set of chromosomes.
مائٹوسس کا مرحلہ جس میں کرومیٹڈز قطبوں تک پہنچ جاتے ہیں اور ان کی حرکت بند ہو جاتی ہے؟
Prophase
Metaphase
Anaphase
Telophase
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Explanation
In Telophase, the chromatids (now called chromosomes) have reached the poles of the cell and their movement ceases. The nuclear envelope begins to reform around each set of chromosomes, and the cytoskeleton reorganizes to prepare the cell for cytokinesis (cell division).
سیل ڈویژن کی ایک قسم جس میں بیضہ مادر سیل بیضہ پیدا کرتا ہے؟
Amitosis
Mitosis
Meiosis
Both A and B
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Explanation
Meiosis is a type of cell division that occurs in spore-producing organisms, such as plants and fungi, to produce spores. In meiosis, a diploid spore mother cell (sporocyte) undergoes two successive cell divisions (meiosis I and meiosis II) to produce four haploid spores.
مییووسس کے بارے میں غلط بیان کا انتخاب کریں؟
Maintain chromosome number from generation to generation
Reduces the diploid number of chromosomes to half
Takes place in germ cell to produce gametes
Production of new somatic cells from germ cells
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Explanation
Meiosis is a type of cell division that occurs in germ cells (reproductive cells) to produce gametes (sperm or egg cells). It does not produce new somatic cells (non-reproductive cells).
جسمانی تبدیلیوں کا سلسلہ کس خلیے سے خودکشی کرتا ہے؟
Apoptosis
Necrosis
Autophagy
Both A and B
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Explanation
The sequence of physiological changes by which a cell commits suicide is called apoptosis.This is a controlled, programmed cell death process that is crucial for maintaining healthy tissue function and development.
جانوروں کے خلیے میں مائٹوسس کے پروفیز کے دوران کون سا عمل ہوتا ہے؟
Division of centromeres
Formation of chromosomes
Replication of DNA
Separation of centrioles
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Explanation
During prophase of mitosis in an animal cell , separation of centrioles occurs. The centrioles move to opposite poles of the cell to help organize the mitotic spindle.
مندرجہ ذیل میں سے کون سا مماثل ہے؟
Anaphase → Chromatids move
Prophase → Centriole move
Telophase → Nuclear membrane disappear
Metaphase → Chromosome line up
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Explanation
The mismatched one is : Telophase → Nuclear membrane disappear.In Telophase, the nuclear membrane reforms around each set of chromosomes, not disappears. The nuclear envelope breaks down during Prophase, and reforms in Telophase.
مائٹوسس کے میٹا فیز میں کیا ہوتا ہے؟
Chromosome line up on the equator of the cell
Chromatids reach the poles of the spindle
Chromatids separate and move to opposite poles
Chromosomes start to coil up and become visible
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Explanation
In metaphase , the chromosomes (now consisting of two sister chromatids each) align themselves at the center of the cell, attached to the microtubules of the mitotic spindle.This forms the metaphase plate , where each chromosome is positioned at the equator of the cell, ready for separation.
مندرجہ ذیل میں سے ایک مماثل کو منتخب کریں؟
Plastids → Storage of chemicals
Centriole → Help in cell division
Ribosomes → Synthesis of steroids
Mitochondria → Synthesis of ATP
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Explanation
Ribosomes are responsible for protein synthesis , not steroid synthesis. Steroid synthesis occurs in the endoplasmic reticulum and other organelles, but not in ribosomes.
